126 UNIVERSITY OF COLORADO STUDIES 



Vertigo milium Gld. Succinea avara Say 



Vallonia cyclophorella Anc. Lymnaea palustris Mull. 



V Urea rhoadsi Pils. Lymnaea caperata Say 



Vitrina alaskana Dall Planorbis trivolvis Say 



Euconulus trochiformis Montagu Planorbis parvus Say 



Zonitoides arboreus Say Physa spp. 



Agriolimax campestris Binn. Aplexa hypnorum Linn. 



Pyramidula cronhhitei anthonyi Pils. Vctoa/a lewisi Currier 

 Succinea haydeni W. G. B. 



Some Insects Collected in Northwestern Colorado in 1909 



By T. D. A. Cockerell 



The insects recorded in this paper were obtained by the University of Colorado 

 Expedition in 1909 under Professor Junius Henderson. Collectors' names are 

 abbreviated as follows: H.=J. Henderson, R.=W. W. Robbins, D.=Terry Duce. 



lepidoptera rhopalocera 



Danais plexippus (L.) var. a. Inner spots of apical patch of anterior wings large 

 and fulvous. Newcastle, August 2 (R.). 



Basilarchia misippus (L.) var. a. Entirely misippus, but showing a slight 

 tendency toward B. hulstii in the better-developed submarginal white spots, and the 

 presence of five fulvous patches in the black apical area of anterior wings. New- 

 castle, August 3 (R.). 



B. weidemeyeri (Edw.) var. a. Female; white band on under side of hind wings 

 rather narrow, the costal white patch no larger than the others; basal area (before the 

 band) larger; orange lunules on hind wing beneath dull, and pallid basally. Meeker 

 August 8 (D.). 



Argynnis leto charlottii (Barnes). Newcastle (R.). This is a good subspecies 

 of A. leto; the yellow border on hind wings beneath (female) is much broader. I 

 do not quite understand the name; was it after one Charlotte, and if so why has it a 

 masculine termination ? Genuine A. leto occurs only westward of Colorado. 



Satyrus charon (Edw.). Fitzgerald's, September 2 (D.). 



S. alope olympus (Edw.). Meeker, August 9; Newcastle, August 2, "Com- 

 mon" (both R.). 



Pieris beckerii (Edw.). Buford, August 21 (H). I have specimens of this which 

 I collected at San Pedro and La Jolla, California, but in spite of the very different 

 environment, it is impossible to separate the Colorado insect even as a race. Mr. 

 Nash took P. beckerii years ago at Poncha Pass, Colorado. 



P. rapae L. Buford, August 21 (D.). This is a species of Europe, introduced. 



P. occidentalis Reakirt. Newcastle, August 2 (R.). 



